Fiberglass Windows

Fiberglass windows and doors are made with pultruded fiberglass, a material patented nearly 20 years ago. Fiberglass is tough, smart, long lasting, and worry-free.

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WHY FIBERGLASS?

Integrity windows and doors are made with Ultrex pultruded fiberglass, a material patented nearly 20 years ago when Integrity pioneered the fiberglass windows and door category. Integrity has led the category ever since with a commitment to a product that is tough, smart, long lasting, and worry-free.

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THE FACTS PROVE IT.

Ultrex is quite possibly the perfect building material for windows and doors. It’s durable, strong, stable, low-maintenance and efficient. Integrity windows and doors made with Ultrex pultruded fiberglass outperform roll-form aluminum, vinyl, and vinyl/wood composites in virtually every measurable category. While other windows might bend, break, or crack over time, Integrity windows hold strong and perform under great stress without showing age or wear.

These are the facts:

Ultrex is eight times stronger than vinyl and three times stronger than wood/vinyl composites.

That’s as tough as steel.

So when a house settles and time marches on, Integrity windows stay true and resist sagging—proving that they’re truly built to last.

ALL ULTREX WINDOWS

You’ve heard of vinyl windows and you’ve heard of wood and aluminum windows. But what you haven’t heard is that Ultrex Fiberglass windows outperform them all. The All Ultrex Line by Marvin Integrity utilizes Marvin’s state of the art fiberglass on both the interior and exterior of the window, bringing you the most durable window available today.

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ULTREX/WOOD WINDOWS

Durability and style are words that best describe Integrity from Marvin. Featuring the strength of fiberglass exterior and the beauty a real wood interior, Integrity fiberglass windows are quite possibly the most durable and beautiful windows you’ll ever put in your house.  With Integrity Windows, you can have the best of both worlds; fiberglass and wood.